我应该在rethinkDB中关闭与DB的每个连接吗?

我有一个用python构建的服务器,使用Tornado和RethinkDB。它已经运行了很长一段时间,为每个用户打开了几个到数据库的连接。我从来没有遇到过任何重大问题,因为我没有把它们打开,也没有把它们关上。但是查看日志文件,我发现有很多这样的警告:

File "/home/bundleroot/commentserver/app.py", line 30, in <module>
        db_connection = r.connect(RDB_HOST,RDB_PORT) 
      File "/home/bundleroot/commentserver/env34/lib/python3.4/site-packages/rethinkdb/net.py", line 542, in connect
        return conn.reconnect(timeout)
      File "/home/bundleroot/commentserver/env34/lib/python3.4/site-packages/rethinkdb/net.py", line 475, in reconnect
        return self._instance.connect(timeout)
      File "/home/bundleroot/commentserver/env34/lib/python3.4/site-packages/rethinkdb/net.py", line 360, in connect
        self._socket = SocketWrapper(self, timeout)
      File "/home/bundleroot/commentserver/env34/lib/python3.4/site-packages/rethinkdb/net.py", line 268, in __init__
        (self.host, self.port, ex))
    rethinkdb.errors.RqlDriverError: Could not connect to localhost:28015. Error: [Errno 111] Connection refused
    Traceback (most recent call last):
      File "/home/bundleroot/commentserver/env34/lib/python3.4/site-packages/rethinkdb/net.py", line 244, in __init__
        socket.create_connection((self.host, self.port), timeout)
      File "/usr/lib/python3.4/socket.py", line 509, in create_connection
        raise err
      File "/usr/lib/python3.4/socket.py", line 500, in create_connection
        sock.connect(sa)
    ConnectionRefusedError: [Errno 111] Connection refused

我该担心吗?在这种情况下,什么是好的做法?